Aged Professor

Suspect

Heraclius

Miriam's father

Colonel Hebron

Sir Nicholss Fanner

The Marquess of Winchester

Thompson

Sir Roland Hall

Uncle Felix

Brogan-Moore

Sir Edward Gait

Flewitt

(voice)

Makato

Slartibartfast

Quimby Charles

Sir John Hargreaves

Lord Bartlesham

Mr. Price

Mr. Becket

Fassbender

Gentleman (uncredited)

Sir Maxwell Dean

George Cornfield

Col. Mathews

Sir Lionel Hibury

Dr. Edwards

Dr Whitman

Stanley

Lewis

Andrew Coombes

Councilman

Chairman of the Board of Governors (uncredited)

Colonel

Professor Krempe

Sir Roger Wedgewood

Lord Hetherby

Sir Edward Seabrook

Race Course Official (uncredited)

Dr. Vivian

Lord Brisburn

Smithers

Man on Train

Roddinghead

Lord Willie Mounset

Government Official at Enquiry (uncredited)

Prime Minister

Johnnie Paxton

Dr. Aldrich

John Crewe

Pearson

Viney

Edgar Hargraves

Doctor at Crime Scene

Manager

Under Secretary

Leading man in play